For all paths of Earth satellites, one focus of the path is
A) the location from which the satellite was launched.
B) Earth's center.
C) the Sun's center.
D) need more information
Answer: B
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Mercury's average density is about as high as Earth's. This is most likely because
A. it is composed of material blasted off Earth in a collision. B. it is highly compressed by its own gravity. C. unlike Earth, it does not have a (light) atmosphere that lowers its average density. D. it contains a significantly higher fraction of iron than Earth.
Which of the following is not the name of one of the phases of the Moon?
A) first-quarter moon B) third-quarter moon C) half moon D) new moon E) full moon
Earthquakes are caused by the
A) friction between diverging plates. B) sudden release of energy that is stored elastically in deforming rocks. C) expansion of Earth's crust. D) combined motion of tectonic plates.
Evaporation from the oceans produces clouds that precipitate fresh water rather than saltwater because
A) salt is too heavy to evaporate. B) evaporation produces nearly pure water vapor. C) dissolved salt prevents evaporation. D) saltwater precipitates over oceans only.